libchromeos: Clean up/moved file into sub-directories

Moved related files in libchromeos into sub-directories
to make it easier to navigate code.

BUG=None
TEST=FEATURES=test emerge-link libchromeos buffet peerd
CQ-DEPEND=CL:214763

Change-Id: I50d690f19f09a8f4d0da1154e63f58c76c415a55
Reviewed-on: https://chromium-review.googlesource.com/214499
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
diff --git a/buffet/main.cc b/buffet/main.cc
index 18b7d4d..fde5c86 100644
--- a/buffet/main.cc
+++ b/buffet/main.cc
@@ -12,8 +12,8 @@
 #include <base/message_loop/message_loop.h>
 #include <base/strings/string_util.h>
 #include <base/strings/stringprintf.h>
-#include <chromeos/async_event_sequencer.h>
-#include <chromeos/exported_object_manager.h>
+#include <chromeos/dbus/async_event_sequencer.h>
+#include <chromeos/dbus/exported_object_manager.h>
 #include <dbus/bus.h>
 #include <sysexits.h>